Invader 511 No.1

Hard to find No.1.  This model has the Concentric "Bullseye" Eraser Design.  During the 1920s and 1930s, fountain pens and early ballpoints were growing in popularity, but mistakes were highly permanent. To solve this without requiring a completely separate desk tool, pencil manufacturers built a two-in-one system directly into the ferrule.

• The Outer Ring: Made of soft, non-abrasive pink or red rubber, formulated for standard graphite pencil marks.
• The Inner Center Core: A tight, dense circle running down the middle of the plug. This core was heavily packed with fine abrasives (like pumice or silica). It was highly rigid and designed precisely to scrape away paper fibers to lift ink or heavily stubborn carbon copying marks.

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